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Security audit

gembox-skill

Security checks for vulnerabilities and agentic risk

Overview

This skill is a GemBox coding-reference helper with broad but disclosed documentation lookup behavior and no evidence of hidden execution, persistence, or data exfiltration.

Before installing, understand that this skill may activate for a wide range of GemBox-related file and email coding tasks and may direct the agent to official GemBox web documentation if local docs are insufficient. Avoid including proprietary code, credentials, private URLs, or sensitive business context in web searches or examples shared externally.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Rogue AgentSelf-Modification, Session Persistence
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (3)

Session Persistence

Medium
Category
Rogue Agent
Confidence
60% confidence
Finding

Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Content

Scanner excerpt · SKILL.md (reported line 3)May include surrounding context.

md
---
name: gembox-skill
description: Coding assistance for [GemBox components](https://www.gemboxsoftware.com/). Use when users ask about any GemBox component or coding task that can be performed with a GemBox component. This includes GemBox.Spreadsheet (.NET read/write Excel files), GemBox.Document (.NET read/write Word files), GemBox.Pdf (.NET read/write PDF files), GemBox.Presentation (.NET read/write PowerPoint files), GemBox.Email (.NET read/write email files, send/receive emails), GemBox.Imaging (.NET read/write image files), and GemBox.PdfViewer (JavaScript display/print/save PDF files).
license: MIT
metadata:
  author: gemboxsoftware.com

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
92% confidence
Finding

The trigger description is extremely broad, covering 'any GemBox component or coding task that can be performed with a GemBox component.' In an agent environment, this can cause the skill to activate for many generic coding tasks involving files, email, PDF, or document handling, increasing the chance that its instructions override more appropriate task-specific safeguards or pull the model into unnecessary tool use.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill instructs the agent to search online if local docs are insufficient, but it does not warn against including user code, file contents, secrets, internal paths, or proprietary context in queries or page requests. In practice, this can lead to unintended disclosure of sensitive project details to external services during troubleshooting or API research.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.